What do we know about the explosibility of coal dust in mines?

Author:	Greenwald, H. P.
Year:	1929
Document Type:	USBI
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6112
Series:	Information circular / United States Department of Commerce, Bureau of Mines ;
Report Number:	6112
Subjects:	Coal mines and mining
	Mine explosions
Link:	https://hdl.handle.net/2027/mdp.39015077570185